2 * Driver for Disk-On-Chip 2000 and Millennium
3 * (c) 1999 Machine Vision Holdings, Inc.
4 * (c) 1999, 2000 David Woodhouse <dwmw2@infradead.org>
6 * $Id: doc2000.c,v 1.46 2001/10/02 15:05:13 dwmw2 Exp $
14 #include <linux/mtd/nftl.h>
15 #include <linux/mtd/doc2000.h>
20 * TODO: must be implemented and tested by someone with HW
23 #ifdef CFG_DOC_SUPPORT_2000
24 #define DoC_is_2000(doc) (doc->ChipID == DOC_ChipID_Doc2k)
26 #define DoC_is_2000(doc) (0)
29 #ifdef CFG_DOC_SUPPORT_MILLENNIUM
30 #define DoC_is_Millennium(doc) (doc->ChipID == DOC_ChipID_DocMil)
32 #define DoC_is_Millennium(doc) (0)
35 /* CFG_DOC_PASSIVE_PROBE:
36 In order to ensure that the BIOS checksum is correct at boot time, and
37 hence that the onboard BIOS extension gets executed, the DiskOnChip
38 goes into reset mode when it is read sequentially: all registers
39 return 0xff until the chip is woken up again by writing to the
42 Unfortunately, this means that the probe for the DiskOnChip is unsafe,
43 because one of the first things it does is write to where it thinks
44 the DOCControl register should be - which may well be shared memory
45 for another device. I've had machines which lock up when this is
46 attempted. Hence the possibility to do a passive probe, which will fail
47 to detect a chip in reset mode, but is at least guaranteed not to lock
50 If you have this problem, uncomment the following line:
51 #define CFG_DOC_PASSIVE_PROBE
59 static struct DiskOnChip doc_dev_desc[CFG_MAX_DOC_DEVICE];
61 /* Current DOC Device */
62 static int curr_device = -1;
64 /* Supported NAND flash devices */
65 static struct nand_flash_dev nand_flash_ids[] = {
66 {"Toshiba TC5816BDC", NAND_MFR_TOSHIBA, 0x64, 21, 1, 2, 0x1000, 0},
67 {"Toshiba TC5832DC", NAND_MFR_TOSHIBA, 0x6b, 22, 0, 2, 0x2000, 0},
68 {"Toshiba TH58V128DC", NAND_MFR_TOSHIBA, 0x73, 24, 0, 2, 0x4000, 0},
69 {"Toshiba TC58256FT/DC", NAND_MFR_TOSHIBA, 0x75, 25, 0, 2, 0x4000, 0},
70 {"Toshiba TH58512FT", NAND_MFR_TOSHIBA, 0x76, 26, 0, 3, 0x4000, 0},
71 {"Toshiba TC58V32DC", NAND_MFR_TOSHIBA, 0xe5, 22, 0, 2, 0x2000, 0},
72 {"Toshiba TC58V64AFT/DC", NAND_MFR_TOSHIBA, 0xe6, 23, 0, 2, 0x2000, 0},
73 {"Toshiba TC58V16BDC", NAND_MFR_TOSHIBA, 0xea, 21, 1, 2, 0x1000, 0},
74 {"Toshiba TH58100FT", NAND_MFR_TOSHIBA, 0x79, 27, 0, 3, 0x4000, 0},
75 {"Samsung KM29N16000", NAND_MFR_SAMSUNG, 0x64, 21, 1, 2, 0x1000, 0},
76 {"Samsung unknown 4Mb", NAND_MFR_SAMSUNG, 0x6b, 22, 0, 2, 0x2000, 0},
77 {"Samsung KM29U128T", NAND_MFR_SAMSUNG, 0x73, 24, 0, 2, 0x4000, 0},
78 {"Samsung KM29U256T", NAND_MFR_SAMSUNG, 0x75, 25, 0, 2, 0x4000, 0},
79 {"Samsung unknown 64Mb", NAND_MFR_SAMSUNG, 0x76, 26, 0, 3, 0x4000, 0},
80 {"Samsung KM29W32000", NAND_MFR_SAMSUNG, 0xe3, 22, 0, 2, 0x2000, 0},
81 {"Samsung unknown 4Mb", NAND_MFR_SAMSUNG, 0xe5, 22, 0, 2, 0x2000, 0},
82 {"Samsung KM29U64000", NAND_MFR_SAMSUNG, 0xe6, 23, 0, 2, 0x2000, 0},
83 {"Samsung KM29W16000", NAND_MFR_SAMSUNG, 0xea, 21, 1, 2, 0x1000, 0},
84 {"Samsung K9F5616Q0C", NAND_MFR_SAMSUNG, 0x45, 25, 0, 2, 0x4000, 1},
85 {"Samsung K9K1216Q0C", NAND_MFR_SAMSUNG, 0x46, 26, 0, 3, 0x4000, 1},
86 {"Samsung K9F1G08U0M", NAND_MFR_SAMSUNG, 0xf1, 27, 0, 2, 0, 0},
90 /* ------------------------------------------------------------------------- */
92 int do_doc (cmd_tbl_t *cmdtp, int flag, int argc, char *argv[])
99 printf ("Usage:\n%s\n", cmdtp->usage);
102 if (strcmp(argv[1],"info") == 0) {
107 for (i=0; i<CFG_MAX_DOC_DEVICE; ++i) {
108 if(doc_dev_desc[i].ChipID == DOC_ChipID_UNKNOWN)
109 continue; /* list only known devices */
110 printf ("Device %d: ", i);
111 doc_print(&doc_dev_desc[i]);
115 } else if (strcmp(argv[1],"device") == 0) {
116 if ((curr_device < 0) || (curr_device >= CFG_MAX_DOC_DEVICE)) {
117 puts ("\nno devices available\n");
120 printf ("\nDevice %d: ", curr_device);
121 doc_print(&doc_dev_desc[curr_device]);
124 printf ("Usage:\n%s\n", cmdtp->usage);
127 if (strcmp(argv[1],"device") == 0) {
128 int dev = (int)simple_strtoul(argv[2], NULL, 10);
130 printf ("\nDevice %d: ", dev);
131 if (dev >= CFG_MAX_DOC_DEVICE) {
132 puts ("unknown device\n");
135 doc_print(&doc_dev_desc[dev]);
138 if (doc_dev_desc[dev].ChipID == DOC_ChipID_UNKNOWN) {
144 puts ("... is now current device\n");
149 printf ("Usage:\n%s\n", cmdtp->usage);
152 /* at least 4 args */
154 if (strcmp(argv[1],"read") == 0 || strcmp(argv[1],"write") == 0) {
155 ulong addr = simple_strtoul(argv[2], NULL, 16);
156 ulong off = simple_strtoul(argv[3], NULL, 16);
157 ulong size = simple_strtoul(argv[4], NULL, 16);
158 int cmd = (strcmp(argv[1],"read") == 0);
161 printf ("\nDOC %s: device %d offset %ld, size %ld ... ",
162 cmd ? "read" : "write", curr_device, off, size);
164 ret = doc_rw(doc_dev_desc + curr_device, cmd, off, size,
165 (size_t *)&total, (u_char*)addr);
167 printf ("%d bytes %s: %s\n", total, cmd ? "read" : "write",
168 ret ? "ERROR" : "OK");
171 } else if (strcmp(argv[1],"erase") == 0) {
172 ulong off = simple_strtoul(argv[2], NULL, 16);
173 ulong size = simple_strtoul(argv[3], NULL, 16);
176 printf ("\nDOC erase: device %d offset %ld, size %ld ... ",
177 curr_device, off, size);
179 ret = doc_erase (doc_dev_desc + curr_device, off, size);
181 printf("%s\n", ret ? "ERROR" : "OK");
185 printf ("Usage:\n%s\n", cmdtp->usage);
194 "doc - Disk-On-Chip sub-system\n",
195 "info - show available DOC devices\n"
196 "doc device [dev] - show or set current device\n"
197 "doc read addr off size\n"
198 "doc write addr off size - read/write `size'"
199 " bytes starting at offset `off'\n"
200 " to/from memory address `addr'\n"
201 "doc erase off size - erase `size' bytes of DOC from offset `off'\n"
204 int do_docboot (cmd_tbl_t *cmdtp, int flag, int argc, char *argv[])
206 char *boot_device = NULL;
214 #if defined(CONFIG_FIT)
215 const void *fit_hdr = NULL;
218 show_boot_progress (34);
221 addr = CFG_LOAD_ADDR;
222 boot_device = getenv ("bootdevice");
225 addr = simple_strtoul(argv[1], NULL, 16);
226 boot_device = getenv ("bootdevice");
229 addr = simple_strtoul(argv[1], NULL, 16);
230 boot_device = argv[2];
233 addr = simple_strtoul(argv[1], NULL, 16);
234 boot_device = argv[2];
235 offset = simple_strtoul(argv[3], NULL, 16);
238 printf ("Usage:\n%s\n", cmdtp->usage);
239 show_boot_progress (-35);
243 show_boot_progress (35);
245 puts ("\n** No boot device **\n");
246 show_boot_progress (-36);
249 show_boot_progress (36);
251 dev = simple_strtoul(boot_device, &ep, 16);
253 if ((dev >= CFG_MAX_DOC_DEVICE) ||
254 (doc_dev_desc[dev].ChipID == DOC_ChipID_UNKNOWN)) {
255 printf ("\n** Device %d not available\n", dev);
256 show_boot_progress (-37);
259 show_boot_progress (37);
261 printf ("\nLoading from device %d: %s at 0x%lX (offset 0x%lX)\n",
262 dev, doc_dev_desc[dev].name, doc_dev_desc[dev].physadr,
265 if (doc_rw (doc_dev_desc + dev, 1, offset,
266 SECTORSIZE, NULL, (u_char *)addr)) {
267 printf ("** Read error on %d\n", dev);
268 show_boot_progress (-38);
271 show_boot_progress (38);
273 switch (genimg_get_format ((void *)addr)) {
274 case IMAGE_FORMAT_LEGACY:
275 hdr = (image_header_t *)addr;
277 image_print_contents (hdr);
279 cnt = image_get_image_size (hdr);
281 #if defined(CONFIG_FIT)
282 case IMAGE_FORMAT_FIT:
283 fit_hdr = (const void *)addr;
284 puts ("Fit image detected...\n");
286 cnt = fit_get_size (fit_hdr);
290 show_boot_progress (-39);
291 puts ("** Unknown image type\n");
294 show_boot_progress (39);
297 if (doc_rw (doc_dev_desc + dev, 1, offset + SECTORSIZE, cnt,
298 NULL, (u_char *)(addr+SECTORSIZE))) {
299 printf ("** Read error on %d\n", dev);
300 show_boot_progress (-40);
303 show_boot_progress (40);
305 #if defined(CONFIG_FIT)
306 /* This cannot be done earlier, we need complete FIT image in RAM first */
307 if (genimg_get_format ((void *)addr) == IMAGE_FORMAT_FIT) {
308 if (!fit_check_format (fit_hdr)) {
309 show_boot_progress (-130);
310 puts ("** Bad FIT image format\n");
313 show_boot_progress (131);
314 fit_print_contents (fit_hdr);
318 /* Loading ok, update default load address */
322 /* Check if we should attempt an auto-start */
323 if (((ep = getenv("autostart")) != NULL) && (strcmp(ep,"yes") == 0)) {
325 extern int do_bootm (cmd_tbl_t *, int, int, char *[]);
327 local_args[0] = argv[0];
328 local_args[1] = NULL;
330 printf ("Automatic boot of image at addr 0x%08lX ...\n", addr);
332 do_bootm (cmdtp, 0, 1, local_args);
339 docboot, 4, 1, do_docboot,
340 "docboot - boot from DOC device\n",
344 int doc_rw (struct DiskOnChip* this, int cmd,
345 loff_t from, size_t len,
346 size_t * retlen, u_char * buf)
348 int noecc, ret = 0, n, total = 0;
352 /* The ECC will not be calculated correctly if
353 less than 512 is written or read */
354 noecc = (from != (from | 0x1ff) + 1) || (len < 0x200);
357 ret = doc_read_ecc(this, from, len,
358 (size_t *)&n, (u_char*)buf,
359 noecc ? (uchar *)NULL : (uchar *)eccbuf);
361 ret = doc_write_ecc(this, from, len,
362 (size_t *)&n, (u_char*)buf,
363 noecc ? (uchar *)NULL : (uchar *)eccbuf);
380 void doc_print(struct DiskOnChip *this) {
381 printf("%s at 0x%lX,\n"
382 "\t %d chip%s %s, size %d MB, \n"
383 "\t total size %ld MB, sector size %ld kB\n",
384 this->name, this->physadr, this->numchips,
385 this->numchips>1 ? "s" : "", this->chips_name,
386 1 << (this->chipshift - 20),
387 this->totlen >> 20, this->erasesize >> 10);
389 if (this->nftl_found) {
390 struct NFTLrecord *nftl = &this->nftl;
391 unsigned long bin_size, flash_size;
393 bin_size = nftl->nb_boot_blocks * this->erasesize;
394 flash_size = (nftl->nb_blocks - nftl->nb_boot_blocks) * this->erasesize;
396 printf("\t NFTL boot record:\n"
397 "\t Binary partition: size %ld%s\n"
398 "\t Flash disk partition: size %ld%s, offset 0x%lx\n",
399 bin_size > (1 << 20) ? bin_size >> 20 : bin_size >> 10,
400 bin_size > (1 << 20) ? "MB" : "kB",
401 flash_size > (1 << 20) ? flash_size >> 20 : flash_size >> 10,
402 flash_size > (1 << 20) ? "MB" : "kB", bin_size);
404 puts ("\t No NFTL boot record found.\n");
408 /* ------------------------------------------------------------------------- */
410 /* This function is needed to avoid calls of the __ashrdi3 function. */
411 static int shr(int val, int shift) {
415 /* Perform the required delay cycles by reading from the appropriate register */
416 static void DoC_Delay(struct DiskOnChip *doc, unsigned short cycles)
421 for (i = 0; i < cycles; i++) {
422 if (DoC_is_Millennium(doc))
423 dummy = ReadDOC(doc->virtadr, NOP);
425 dummy = ReadDOC(doc->virtadr, DOCStatus);
430 /* DOC_WaitReady: Wait for RDY line to be asserted by the flash chip */
431 static int _DoC_WaitReady(struct DiskOnChip *doc)
433 unsigned long docptr = doc->virtadr;
434 unsigned long start = get_timer(0);
437 puts ("_DoC_WaitReady called for out-of-line wait\n");
440 /* Out-of-line routine to wait for chip response */
441 while (!(ReadDOC(docptr, CDSNControl) & CDSN_CTRL_FR_B)) {
442 #ifdef CFG_DOC_SHORT_TIMEOUT
443 /* it seems that after a certain time the DoC deasserts
444 * the CDSN_CTRL_FR_B although it is not ready...
445 * using a short timout solve this (timer increments every ms) */
446 if (get_timer(start) > 10) {
450 if (get_timer(start) > 10 * 1000) {
451 puts ("_DoC_WaitReady timed out.\n");
461 static int DoC_WaitReady(struct DiskOnChip *doc)
463 unsigned long docptr = doc->virtadr;
464 /* This is inline, to optimise the common case, where it's ready instantly */
467 /* 4 read form NOP register should be issued in prior to the read from CDSNControl
468 see Software Requirement 11.4 item 2. */
471 if (!(ReadDOC(docptr, CDSNControl) & CDSN_CTRL_FR_B))
472 /* Call the out-of-line routine to wait */
473 ret = _DoC_WaitReady(doc);
475 /* issue 2 read from NOP register after reading from CDSNControl register
476 see Software Requirement 11.4 item 2. */
482 /* DoC_Command: Send a flash command to the flash chip through the CDSN Slow IO register to
483 bypass the internal pipeline. Each of 4 delay cycles (read from the NOP register) is
484 required after writing to CDSN Control register, see Software Requirement 11.4 item 3. */
486 static inline int DoC_Command(struct DiskOnChip *doc, unsigned char command,
487 unsigned char xtraflags)
489 unsigned long docptr = doc->virtadr;
491 if (DoC_is_2000(doc))
492 xtraflags |= CDSN_CTRL_FLASH_IO;
494 /* Assert the CLE (Command Latch Enable) line to the flash chip */
495 WriteDOC(xtraflags | CDSN_CTRL_CLE | CDSN_CTRL_CE, docptr, CDSNControl);
496 DoC_Delay(doc, 4); /* Software requirement 11.4.3 for Millennium */
498 if (DoC_is_Millennium(doc))
499 WriteDOC(command, docptr, CDSNSlowIO);
501 /* Send the command */
502 WriteDOC_(command, docptr, doc->ioreg);
504 /* Lower the CLE line */
505 WriteDOC(xtraflags | CDSN_CTRL_CE, docptr, CDSNControl);
506 DoC_Delay(doc, 4); /* Software requirement 11.4.3 for Millennium */
508 /* Wait for the chip to respond - Software requirement 11.4.1 (extended for any command) */
509 return DoC_WaitReady(doc);
512 /* DoC_Address: Set the current address for the flash chip through the CDSN Slow IO register to
513 bypass the internal pipeline. Each of 4 delay cycles (read from the NOP register) is
514 required after writing to CDSN Control register, see Software Requirement 11.4 item 3. */
516 static int DoC_Address(struct DiskOnChip *doc, int numbytes, unsigned long ofs,
517 unsigned char xtraflags1, unsigned char xtraflags2)
519 unsigned long docptr;
522 docptr = doc->virtadr;
524 if (DoC_is_2000(doc))
525 xtraflags1 |= CDSN_CTRL_FLASH_IO;
527 /* Assert the ALE (Address Latch Enable) line to the flash chip */
528 WriteDOC(xtraflags1 | CDSN_CTRL_ALE | CDSN_CTRL_CE, docptr, CDSNControl);
530 DoC_Delay(doc, 4); /* Software requirement 11.4.3 for Millennium */
532 /* Send the address */
533 /* Devices with 256-byte page are addressed as:
534 Column (bits 0-7), Page (bits 8-15, 16-23, 24-31)
535 * there is no device on the market with page256
536 and more than 24 bits.
537 Devices with 512-byte page are addressed as:
538 Column (bits 0-7), Page (bits 9-16, 17-24, 25-31)
539 * 25-31 is sent only if the chip support it.
540 * bit 8 changes the read command to be sent
541 (NAND_CMD_READ0 or NAND_CMD_READ1).
544 if (numbytes == ADDR_COLUMN || numbytes == ADDR_COLUMN_PAGE) {
545 if (DoC_is_Millennium(doc))
546 WriteDOC(ofs & 0xff, docptr, CDSNSlowIO);
547 WriteDOC_(ofs & 0xff, docptr, doc->ioreg);
556 if (numbytes == ADDR_PAGE || numbytes == ADDR_COLUMN_PAGE) {
557 for (i = 0; i < doc->pageadrlen; i++, ofs = ofs >> 8) {
558 if (DoC_is_Millennium(doc))
559 WriteDOC(ofs & 0xff, docptr, CDSNSlowIO);
560 WriteDOC_(ofs & 0xff, docptr, doc->ioreg);
564 DoC_Delay(doc, 2); /* Needed for some slow flash chips. mf. */
566 /* FIXME: The SlowIO's for millennium could be replaced by
567 a single WritePipeTerm here. mf. */
569 /* Lower the ALE line */
570 WriteDOC(xtraflags1 | xtraflags2 | CDSN_CTRL_CE, docptr,
573 DoC_Delay(doc, 4); /* Software requirement 11.4.3 for Millennium */
575 /* Wait for the chip to respond - Software requirement 11.4.1 */
576 return DoC_WaitReady(doc);
579 /* Read a buffer from DoC, taking care of Millennium oddities */
580 static void DoC_ReadBuf(struct DiskOnChip *doc, u_char * buf, int len)
583 int modulus = 0xffff;
584 unsigned long docptr;
587 docptr = doc->virtadr;
592 if (DoC_is_Millennium(doc)) {
593 /* Read the data via the internal pipeline through CDSN IO register,
594 see Pipelined Read Operations 11.3 */
595 dummy = ReadDOC(docptr, ReadPipeInit);
597 /* Millennium should use the LastDataRead register - Pipeline Reads */
600 /* This is needed for correctly ECC calculation */
604 for (i = 0; i < len; i++)
605 buf[i] = ReadDOC_(docptr, doc->ioreg + (i & modulus));
607 if (DoC_is_Millennium(doc)) {
608 buf[i] = ReadDOC(docptr, LastDataRead);
612 /* Write a buffer to DoC, taking care of Millennium oddities */
613 static void DoC_WriteBuf(struct DiskOnChip *doc, const u_char * buf, int len)
615 unsigned long docptr;
618 docptr = doc->virtadr;
623 for (i = 0; i < len; i++)
624 WriteDOC_(buf[i], docptr, doc->ioreg + i);
626 if (DoC_is_Millennium(doc)) {
627 WriteDOC(0x00, docptr, WritePipeTerm);
632 /* DoC_SelectChip: Select a given flash chip within the current floor */
634 static inline int DoC_SelectChip(struct DiskOnChip *doc, int chip)
636 unsigned long docptr = doc->virtadr;
638 /* Software requirement 11.4.4 before writing DeviceSelect */
639 /* Deassert the CE line to eliminate glitches on the FCE# outputs */
640 WriteDOC(CDSN_CTRL_WP, docptr, CDSNControl);
641 DoC_Delay(doc, 4); /* Software requirement 11.4.3 for Millennium */
643 /* Select the individual flash chip requested */
644 WriteDOC(chip, docptr, CDSNDeviceSelect);
647 /* Reassert the CE line */
648 WriteDOC(CDSN_CTRL_CE | CDSN_CTRL_FLASH_IO | CDSN_CTRL_WP, docptr,
650 DoC_Delay(doc, 4); /* Software requirement 11.4.3 for Millennium */
652 /* Wait for it to be ready */
653 return DoC_WaitReady(doc);
656 /* DoC_SelectFloor: Select a given floor (bank of flash chips) */
658 static inline int DoC_SelectFloor(struct DiskOnChip *doc, int floor)
660 unsigned long docptr = doc->virtadr;
662 /* Select the floor (bank) of chips required */
663 WriteDOC(floor, docptr, FloorSelect);
665 /* Wait for the chip to be ready */
666 return DoC_WaitReady(doc);
669 /* DoC_IdentChip: Identify a given NAND chip given {floor,chip} */
671 static int DoC_IdentChip(struct DiskOnChip *doc, int floor, int chip)
676 /* Page in the required floor/chip */
677 DoC_SelectFloor(doc, floor);
678 DoC_SelectChip(doc, chip);
681 if (DoC_Command(doc, NAND_CMD_RESET, CDSN_CTRL_WP)) {
683 printf("DoC_Command (reset) for %d,%d returned true\n",
690 /* Read the NAND chip ID: 1. Send ReadID command */
691 if (DoC_Command(doc, NAND_CMD_READID, CDSN_CTRL_WP)) {
693 printf("DoC_Command (ReadID) for %d,%d returned true\n",
699 /* Read the NAND chip ID: 2. Send address byte zero */
700 DoC_Address(doc, ADDR_COLUMN, 0, CDSN_CTRL_WP, 0);
702 /* Read the manufacturer and device id codes from the device */
704 /* CDSN Slow IO register see Software Requirement 11.4 item 5. */
705 dummy = ReadDOC(doc->virtadr, CDSNSlowIO);
707 mfr = ReadDOC_(doc->virtadr, doc->ioreg);
709 /* CDSN Slow IO register see Software Requirement 11.4 item 5. */
710 dummy = ReadDOC(doc->virtadr, CDSNSlowIO);
712 id = ReadDOC_(doc->virtadr, doc->ioreg);
714 /* No response - return failure */
715 if (mfr == 0xff || mfr == 0)
718 /* Check it's the same as the first chip we identified.
719 * M-Systems say that any given DiskOnChip device should only
720 * contain _one_ type of flash part, although that's not a
721 * hardware restriction. */
723 if (doc->mfr == mfr && doc->id == id)
724 return 1; /* This is another the same the first */
726 printf("Flash chip at floor %d, chip %d is different:\n",
730 /* Print and store the manufacturer and ID codes. */
731 for (i = 0; nand_flash_ids[i].name != NULL; i++) {
732 if (mfr == nand_flash_ids[i].manufacture_id &&
733 id == nand_flash_ids[i].model_id) {
735 printf("Flash chip found: Manufacturer ID: %2.2X, "
736 "Chip ID: %2.2X (%s)\n", mfr, id,
737 nand_flash_ids[i].name);
743 nand_flash_ids[i].chipshift;
744 doc->page256 = nand_flash_ids[i].page256;
746 nand_flash_ids[i].pageadrlen;
748 nand_flash_ids[i].erasesize;
750 nand_flash_ids[i].name;
759 /* We haven't fully identified the chip. Print as much as we know. */
760 printf("Unknown flash chip found: %2.2X %2.2X\n",
767 /* DoC_ScanChips: Find all NAND chips present in a DiskOnChip, and identify them */
769 static void DoC_ScanChips(struct DiskOnChip *this)
772 int numchips[MAX_FLOORS];
773 int maxchips = MAX_CHIPS;
780 if (DoC_is_Millennium(this))
781 maxchips = MAX_CHIPS_MIL;
783 /* For each floor, find the number of valid chips it contains */
784 for (floor = 0; floor < MAX_FLOORS; floor++) {
787 for (chip = 0; chip < maxchips && ret != 0; chip++) {
789 ret = DoC_IdentChip(this, floor, chip);
797 /* If there are none at all that we recognise, bail */
798 if (!this->numchips) {
799 puts ("No flash chips recognised.\n");
803 /* Allocate an array to hold the information for each chip */
804 this->chips = malloc(sizeof(struct Nand) * this->numchips);
806 puts ("No memory for allocating chip info structures\n");
812 /* Fill out the chip array with {floor, chipno} for each
813 * detected chip in the device. */
814 for (floor = 0; floor < MAX_FLOORS; floor++) {
815 for (chip = 0; chip < numchips[floor]; chip++) {
816 this->chips[ret].floor = floor;
817 this->chips[ret].chip = chip;
818 this->chips[ret].curadr = 0;
819 this->chips[ret].curmode = 0x50;
824 /* Calculate and print the total size of the device */
825 this->totlen = this->numchips * (1 << this->chipshift);
828 printf("%d flash chips found. Total DiskOnChip size: %ld MB\n",
829 this->numchips, this->totlen >> 20);
833 /* find_boot_record: Find the NFTL Media Header and its Spare copy which contains the
834 * various device information of the NFTL partition and Bad Unit Table. Update
835 * the ReplUnitTable[] table accroding to the Bad Unit Table. ReplUnitTable[]
836 * is used for management of Erase Unit in other routines in nftl.c and nftlmount.c
838 static int find_boot_record(struct NFTLrecord *nftl)
842 unsigned int block, boot_record_count = 0;
845 struct NFTLMediaHeader *mh = &nftl->MediaHdr;
848 nftl->MediaUnit = BLOCK_NIL;
849 nftl->SpareMediaUnit = BLOCK_NIL;
851 /* search for a valid boot record */
852 for (block = 0; block < nftl->nb_blocks; block++) {
855 /* Check for ANAND header first. Then can whinge if it's found but later
857 if ((ret = doc_read_ecc(nftl->mtd, block * nftl->EraseSize, SECTORSIZE,
858 (size_t *)&retlen, buf, NULL))) {
859 static int warncount = 5;
862 printf("Block read at 0x%x failed\n", block * nftl->EraseSize);
864 puts ("Further failures for this block will not be printed\n");
869 if (retlen < 6 || memcmp(buf, "ANAND", 6)) {
870 /* ANAND\0 not found. Continue */
872 printf("ANAND header not found at 0x%x\n", block * nftl->EraseSize);
878 printf("ANAND header found at 0x%x\n", block * nftl->EraseSize);
881 /* To be safer with BIOS, also use erase mark as discriminant */
882 if ((ret = doc_read_oob(nftl->mtd, block * nftl->EraseSize + SECTORSIZE + 8,
883 8, (size_t *)&retlen, (uchar *)&h1) < 0)) {
885 printf("ANAND header found at 0x%x, but OOB data read failed\n",
886 block * nftl->EraseSize);
891 /* OK, we like it. */
893 if (boot_record_count) {
894 /* We've already processed one. So we just check if
895 this one is the same as the first one we found */
896 if (memcmp(mh, buf, sizeof(struct NFTLMediaHeader))) {
898 printf("NFTL Media Headers at 0x%x and 0x%x disagree.\n",
899 nftl->MediaUnit * nftl->EraseSize, block * nftl->EraseSize);
901 /* if (debug) Print both side by side */
904 if (boot_record_count == 1)
905 nftl->SpareMediaUnit = block;
911 /* This is the first we've seen. Copy the media header structure into place */
912 memcpy(mh, buf, sizeof(struct NFTLMediaHeader));
914 /* Do some sanity checks on it */
915 if (mh->UnitSizeFactor == 0) {
917 puts ("UnitSizeFactor 0x00 detected.\n"
918 "This violates the spec but we think we know what it means...\n");
920 } else if (mh->UnitSizeFactor != 0xff) {
921 printf ("Sorry, we don't support UnitSizeFactor "
926 nftl->nb_boot_blocks = le16_to_cpu(mh->FirstPhysicalEUN);
927 if ((nftl->nb_boot_blocks + 2) >= nftl->nb_blocks) {
928 printf ("NFTL Media Header sanity check failed:\n"
929 "nb_boot_blocks (%d) + 2 > nb_blocks (%d)\n",
930 nftl->nb_boot_blocks, nftl->nb_blocks);
934 nftl->numvunits = le32_to_cpu(mh->FormattedSize) / nftl->EraseSize;
935 if (nftl->numvunits > (nftl->nb_blocks - nftl->nb_boot_blocks - 2)) {
936 printf ("NFTL Media Header sanity check failed:\n"
937 "numvunits (%d) > nb_blocks (%d) - nb_boot_blocks(%d) - 2\n",
940 nftl->nb_boot_blocks);
944 nftl->nr_sects = nftl->numvunits * (nftl->EraseSize / SECTORSIZE);
946 /* If we're not using the last sectors in the device for some reason,
947 reduce nb_blocks accordingly so we forget they're there */
948 nftl->nb_blocks = le16_to_cpu(mh->NumEraseUnits) + le16_to_cpu(mh->FirstPhysicalEUN);
950 /* read the Bad Erase Unit Table and modify ReplUnitTable[] accordingly */
951 for (i = 0; i < nftl->nb_blocks; i++) {
952 if ((i & (SECTORSIZE - 1)) == 0) {
953 /* read one sector for every SECTORSIZE of blocks */
954 if ((ret = doc_read_ecc(nftl->mtd, block * nftl->EraseSize +
955 i + SECTORSIZE, SECTORSIZE,
956 (size_t *)&retlen, buf, (uchar *)&oob)) < 0) {
957 puts ("Read of bad sector table failed\n");
961 /* mark the Bad Erase Unit as RESERVED in ReplUnitTable */
962 if (buf[i & (SECTORSIZE - 1)] != 0xff)
963 nftl->ReplUnitTable[i] = BLOCK_RESERVED;
966 nftl->MediaUnit = block;
969 } /* foreach (block) */
971 return boot_record_count?0:-1;
974 /* This routine is made available to other mtd code via
975 * inter_module_register. It must only be accessed through
976 * inter_module_get which will bump the use count of this module. The
977 * addresses passed back in mtd are valid as long as the use count of
978 * this module is non-zero, i.e. between inter_module_get and
979 * inter_module_put. Keith Owens <kaos@ocs.com.au> 29 Oct 2000.
981 static void DoC2k_init(struct DiskOnChip* this)
983 struct NFTLrecord *nftl;
985 switch (this->ChipID) {
986 case DOC_ChipID_Doc2k:
987 this->name = "DiskOnChip 2000";
988 this->ioreg = DoC_2k_CDSN_IO;
990 case DOC_ChipID_DocMil:
991 this->name = "DiskOnChip Millennium";
992 this->ioreg = DoC_Mil_CDSN_IO;
997 printf("%s found at address 0x%lX\n", this->name,
1004 this->curfloor = -1;
1007 /* Ident all the chips present. */
1008 DoC_ScanChips(this);
1009 if ((!this->numchips) || (!this->chips))
1014 /* Get physical parameters */
1015 nftl->EraseSize = this->erasesize;
1016 nftl->nb_blocks = this->totlen / this->erasesize;
1019 if (find_boot_record(nftl) != 0)
1020 this->nftl_found = 0;
1022 this->nftl_found = 1;
1024 printf("%s @ 0x%lX, %ld MB\n", this->name, this->physadr, this->totlen >> 20);
1027 int doc_read_ecc(struct DiskOnChip* this, loff_t from, size_t len,
1028 size_t * retlen, u_char * buf, u_char * eccbuf)
1030 unsigned long docptr;
1031 struct Nand *mychip;
1032 unsigned char syndrome[6];
1033 volatile char dummy;
1034 int i, len256 = 0, ret=0;
1036 docptr = this->virtadr;
1038 /* Don't allow read past end of device */
1039 if (from >= this->totlen) {
1040 puts ("Out of flash\n");
1044 /* Don't allow a single read to cross a 512-byte block boundary */
1045 if (from + len > ((from | 0x1ff) + 1))
1046 len = ((from | 0x1ff) + 1) - from;
1048 /* The ECC will not be calculated correctly if less than 512 is read */
1049 if (len != 0x200 && eccbuf)
1050 printf("ECC needs a full sector read (adr: %lx size %lx)\n",
1051 (long) from, (long) len);
1054 printf("DoC_Read (adr: %lx size %lx)\n", (long) from, (long) len);
1057 /* Find the chip which is to be used and select it */
1058 mychip = &this->chips[shr(from, this->chipshift)];
1060 if (this->curfloor != mychip->floor) {
1061 DoC_SelectFloor(this, mychip->floor);
1062 DoC_SelectChip(this, mychip->chip);
1063 } else if (this->curchip != mychip->chip) {
1064 DoC_SelectChip(this, mychip->chip);
1067 this->curfloor = mychip->floor;
1068 this->curchip = mychip->chip;
1072 && (from & 0x100)) ? NAND_CMD_READ1 : NAND_CMD_READ0,
1074 DoC_Address(this, ADDR_COLUMN_PAGE, from, CDSN_CTRL_WP,
1078 /* Prime the ECC engine */
1079 WriteDOC(DOC_ECC_RESET, docptr, ECCConf);
1080 WriteDOC(DOC_ECC_EN, docptr, ECCConf);
1082 /* disable the ECC engine */
1083 WriteDOC(DOC_ECC_RESET, docptr, ECCConf);
1084 WriteDOC(DOC_ECC_DIS, docptr, ECCConf);
1087 /* treat crossing 256-byte sector for 2M x 8bits devices */
1088 if (this->page256 && from + len > (from | 0xff) + 1) {
1089 len256 = (from | 0xff) + 1 - from;
1090 DoC_ReadBuf(this, buf, len256);
1092 DoC_Command(this, NAND_CMD_READ0, CDSN_CTRL_WP);
1093 DoC_Address(this, ADDR_COLUMN_PAGE, from + len256,
1094 CDSN_CTRL_WP, CDSN_CTRL_ECC_IO);
1097 DoC_ReadBuf(this, &buf[len256], len - len256);
1099 /* Let the caller know we completed it */
1103 /* Read the ECC data through the DiskOnChip ECC logic */
1104 /* Note: this will work even with 2M x 8bit devices as */
1105 /* they have 8 bytes of OOB per 256 page. mf. */
1106 DoC_ReadBuf(this, eccbuf, 6);
1108 /* Flush the pipeline */
1109 if (DoC_is_Millennium(this)) {
1110 dummy = ReadDOC(docptr, ECCConf);
1111 dummy = ReadDOC(docptr, ECCConf);
1112 i = ReadDOC(docptr, ECCConf);
1114 dummy = ReadDOC(docptr, 2k_ECCStatus);
1115 dummy = ReadDOC(docptr, 2k_ECCStatus);
1116 i = ReadDOC(docptr, 2k_ECCStatus);
1119 /* Check the ECC Status */
1122 /* There was an ECC error */
1124 printf("DiskOnChip ECC Error: Read at %lx\n", (long)from);
1126 /* Read the ECC syndrom through the DiskOnChip ECC logic.
1127 These syndrome will be all ZERO when there is no error */
1128 for (i = 0; i < 6; i++) {
1130 ReadDOC(docptr, ECCSyndrome0 + i);
1132 nb_errors = doc_decode_ecc(buf, syndrome);
1135 printf("Errors corrected: %x\n", nb_errors);
1137 if (nb_errors < 0) {
1138 /* We return error, but have actually done the read. Not that
1139 this can be told to user-space, via sys_read(), but at least
1140 MTD-aware stuff can know about it by checking *retlen */
1141 printf("ECC Errors at %lx\n", (long)from);
1147 printf("ECC DATA at %lxB: %2.2X %2.2X %2.2X %2.2X %2.2X %2.2X\n",
1148 (long)from, eccbuf[0], eccbuf[1], eccbuf[2],
1149 eccbuf[3], eccbuf[4], eccbuf[5]);
1152 /* disable the ECC engine */
1153 WriteDOC(DOC_ECC_DIS, docptr , ECCConf);
1156 /* according to 11.4.1, we need to wait for the busy line
1157 * drop if we read to the end of the page. */
1158 if(0 == ((from + *retlen) & 0x1ff))
1160 DoC_WaitReady(this);
1166 int doc_write_ecc(struct DiskOnChip* this, loff_t to, size_t len,
1167 size_t * retlen, const u_char * buf,
1170 int di; /* Yes, DI is a hangover from when I was disassembling the binary driver */
1171 unsigned long docptr;
1172 volatile char dummy;
1174 struct Nand *mychip;
1176 docptr = this->virtadr;
1178 /* Don't allow write past end of device */
1179 if (to >= this->totlen) {
1180 puts ("Out of flash\n");
1184 /* Don't allow a single write to cross a 512-byte block boundary */
1185 if (to + len > ((to | 0x1ff) + 1))
1186 len = ((to | 0x1ff) + 1) - to;
1188 /* The ECC will not be calculated correctly if less than 512 is written */
1189 if (len != 0x200 && eccbuf)
1190 printf("ECC needs a full sector write (adr: %lx size %lx)\n",
1191 (long) to, (long) len);
1193 /* printf("DoC_Write (adr: %lx size %lx)\n", (long) to, (long) len); */
1195 /* Find the chip which is to be used and select it */
1196 mychip = &this->chips[shr(to, this->chipshift)];
1198 if (this->curfloor != mychip->floor) {
1199 DoC_SelectFloor(this, mychip->floor);
1200 DoC_SelectChip(this, mychip->chip);
1201 } else if (this->curchip != mychip->chip) {
1202 DoC_SelectChip(this, mychip->chip);
1205 this->curfloor = mychip->floor;
1206 this->curchip = mychip->chip;
1208 /* Set device to main plane of flash */
1209 DoC_Command(this, NAND_CMD_RESET, CDSN_CTRL_WP);
1212 && (to & 0x100)) ? NAND_CMD_READ1 : NAND_CMD_READ0,
1215 DoC_Command(this, NAND_CMD_SEQIN, 0);
1216 DoC_Address(this, ADDR_COLUMN_PAGE, to, 0, CDSN_CTRL_ECC_IO);
1219 /* Prime the ECC engine */
1220 WriteDOC(DOC_ECC_RESET, docptr, ECCConf);
1221 WriteDOC(DOC_ECC_EN | DOC_ECC_RW, docptr, ECCConf);
1223 /* disable the ECC engine */
1224 WriteDOC(DOC_ECC_RESET, docptr, ECCConf);
1225 WriteDOC(DOC_ECC_DIS, docptr, ECCConf);
1228 /* treat crossing 256-byte sector for 2M x 8bits devices */
1229 if (this->page256 && to + len > (to | 0xff) + 1) {
1230 len256 = (to | 0xff) + 1 - to;
1231 DoC_WriteBuf(this, buf, len256);
1233 DoC_Command(this, NAND_CMD_PAGEPROG, 0);
1235 DoC_Command(this, NAND_CMD_STATUS, CDSN_CTRL_WP);
1236 /* There's an implicit DoC_WaitReady() in DoC_Command */
1238 dummy = ReadDOC(docptr, CDSNSlowIO);
1241 if (ReadDOC_(docptr, this->ioreg) & 1) {
1242 puts ("Error programming flash\n");
1243 /* Error in programming */
1248 DoC_Command(this, NAND_CMD_SEQIN, 0);
1249 DoC_Address(this, ADDR_COLUMN_PAGE, to + len256, 0,
1253 DoC_WriteBuf(this, &buf[len256], len - len256);
1256 WriteDOC(CDSN_CTRL_ECC_IO | CDSN_CTRL_CE, docptr,
1259 if (DoC_is_Millennium(this)) {
1260 WriteDOC(0, docptr, NOP);
1261 WriteDOC(0, docptr, NOP);
1262 WriteDOC(0, docptr, NOP);
1264 WriteDOC_(0, docptr, this->ioreg);
1265 WriteDOC_(0, docptr, this->ioreg);
1266 WriteDOC_(0, docptr, this->ioreg);
1269 /* Read the ECC data through the DiskOnChip ECC logic */
1270 for (di = 0; di < 6; di++) {
1271 eccbuf[di] = ReadDOC(docptr, ECCSyndrome0 + di);
1274 /* Reset the ECC engine */
1275 WriteDOC(DOC_ECC_DIS, docptr, ECCConf);
1279 ("OOB data at %lx is %2.2X %2.2X %2.2X %2.2X %2.2X %2.2X\n",
1280 (long) to, eccbuf[0], eccbuf[1], eccbuf[2], eccbuf[3],
1281 eccbuf[4], eccbuf[5]);
1285 DoC_Command(this, NAND_CMD_PAGEPROG, 0);
1287 DoC_Command(this, NAND_CMD_STATUS, CDSN_CTRL_WP);
1288 /* There's an implicit DoC_WaitReady() in DoC_Command */
1290 dummy = ReadDOC(docptr, CDSNSlowIO);
1293 if (ReadDOC_(docptr, this->ioreg) & 1) {
1294 puts ("Error programming flash\n");
1295 /* Error in programming */
1300 /* Let the caller know we completed it */
1308 /* Write the ECC data to flash */
1309 for (di=0; di<6; di++)
1315 ret = doc_write_oob(this, to, 8, &dummy, x);
1321 int doc_read_oob(struct DiskOnChip* this, loff_t ofs, size_t len,
1322 size_t * retlen, u_char * buf)
1324 int len256 = 0, ret;
1325 unsigned long docptr;
1326 struct Nand *mychip;
1328 docptr = this->virtadr;
1330 mychip = &this->chips[shr(ofs, this->chipshift)];
1332 if (this->curfloor != mychip->floor) {
1333 DoC_SelectFloor(this, mychip->floor);
1334 DoC_SelectChip(this, mychip->chip);
1335 } else if (this->curchip != mychip->chip) {
1336 DoC_SelectChip(this, mychip->chip);
1338 this->curfloor = mychip->floor;
1339 this->curchip = mychip->chip;
1341 /* update address for 2M x 8bit devices. OOB starts on the second */
1342 /* page to maintain compatibility with doc_read_ecc. */
1343 if (this->page256) {
1350 DoC_Command(this, NAND_CMD_READOOB, CDSN_CTRL_WP);
1351 DoC_Address(this, ADDR_COLUMN_PAGE, ofs, CDSN_CTRL_WP, 0);
1353 /* treat crossing 8-byte OOB data for 2M x 8bit devices */
1354 /* Note: datasheet says it should automaticaly wrap to the */
1355 /* next OOB block, but it didn't work here. mf. */
1356 if (this->page256 && ofs + len > (ofs | 0x7) + 1) {
1357 len256 = (ofs | 0x7) + 1 - ofs;
1358 DoC_ReadBuf(this, buf, len256);
1360 DoC_Command(this, NAND_CMD_READOOB, CDSN_CTRL_WP);
1361 DoC_Address(this, ADDR_COLUMN_PAGE, ofs & (~0x1ff),
1365 DoC_ReadBuf(this, &buf[len256], len - len256);
1368 /* Reading the full OOB data drops us off of the end of the page,
1369 * causing the flash device to go into busy mode, so we need
1370 * to wait until ready 11.4.1 and Toshiba TC58256FT docs */
1372 ret = DoC_WaitReady(this);
1378 int doc_write_oob(struct DiskOnChip* this, loff_t ofs, size_t len,
1379 size_t * retlen, const u_char * buf)
1382 unsigned long docptr = this->virtadr;
1383 struct Nand *mychip = &this->chips[shr(ofs, this->chipshift)];
1387 printf("doc_write_oob(%lx, %d): %2.2X %2.2X %2.2X %2.2X ... %2.2X %2.2X .. %2.2X %2.2X\n",
1388 (long)ofs, len, buf[0], buf[1], buf[2], buf[3],
1389 buf[8], buf[9], buf[14],buf[15]);
1392 /* Find the chip which is to be used and select it */
1393 if (this->curfloor != mychip->floor) {
1394 DoC_SelectFloor(this, mychip->floor);
1395 DoC_SelectChip(this, mychip->chip);
1396 } else if (this->curchip != mychip->chip) {
1397 DoC_SelectChip(this, mychip->chip);
1399 this->curfloor = mychip->floor;
1400 this->curchip = mychip->chip;
1402 /* disable the ECC engine */
1403 WriteDOC (DOC_ECC_RESET, docptr, ECCConf);
1404 WriteDOC (DOC_ECC_DIS, docptr, ECCConf);
1406 /* Reset the chip, see Software Requirement 11.4 item 1. */
1407 DoC_Command(this, NAND_CMD_RESET, CDSN_CTRL_WP);
1409 /* issue the Read2 command to set the pointer to the Spare Data Area. */
1410 DoC_Command(this, NAND_CMD_READOOB, CDSN_CTRL_WP);
1412 /* update address for 2M x 8bit devices. OOB starts on the second */
1413 /* page to maintain compatibility with doc_read_ecc. */
1414 if (this->page256) {
1421 /* issue the Serial Data In command to initial the Page Program process */
1422 DoC_Command(this, NAND_CMD_SEQIN, 0);
1423 DoC_Address(this, ADDR_COLUMN_PAGE, ofs, 0, 0);
1425 /* treat crossing 8-byte OOB data for 2M x 8bit devices */
1426 /* Note: datasheet says it should automaticaly wrap to the */
1427 /* next OOB block, but it didn't work here. mf. */
1428 if (this->page256 && ofs + len > (ofs | 0x7) + 1) {
1429 len256 = (ofs | 0x7) + 1 - ofs;
1430 DoC_WriteBuf(this, buf, len256);
1432 DoC_Command(this, NAND_CMD_PAGEPROG, 0);
1433 DoC_Command(this, NAND_CMD_STATUS, 0);
1434 /* DoC_WaitReady() is implicit in DoC_Command */
1436 dummy = ReadDOC(docptr, CDSNSlowIO);
1439 if (ReadDOC_(docptr, this->ioreg) & 1) {
1440 puts ("Error programming oob data\n");
1441 /* There was an error */
1445 DoC_Command(this, NAND_CMD_SEQIN, 0);
1446 DoC_Address(this, ADDR_COLUMN_PAGE, ofs & (~0x1ff), 0, 0);
1449 DoC_WriteBuf(this, &buf[len256], len - len256);
1451 DoC_Command(this, NAND_CMD_PAGEPROG, 0);
1452 DoC_Command(this, NAND_CMD_STATUS, 0);
1453 /* DoC_WaitReady() is implicit in DoC_Command */
1455 dummy = ReadDOC(docptr, CDSNSlowIO);
1458 if (ReadDOC_(docptr, this->ioreg) & 1) {
1459 puts ("Error programming oob data\n");
1460 /* There was an error */
1470 int doc_erase(struct DiskOnChip* this, loff_t ofs, size_t len)
1473 unsigned long docptr;
1474 struct Nand *mychip;
1476 if (ofs & (this->erasesize-1) || len & (this->erasesize-1)) {
1477 puts ("Offset and size must be sector aligned\n");
1481 docptr = this->virtadr;
1483 /* FIXME: Do this in the background. Use timers or schedule_task() */
1485 mychip = &this->chips[shr(ofs, this->chipshift)];
1487 if (this->curfloor != mychip->floor) {
1488 DoC_SelectFloor(this, mychip->floor);
1489 DoC_SelectChip(this, mychip->chip);
1490 } else if (this->curchip != mychip->chip) {
1491 DoC_SelectChip(this, mychip->chip);
1493 this->curfloor = mychip->floor;
1494 this->curchip = mychip->chip;
1496 DoC_Command(this, NAND_CMD_ERASE1, 0);
1497 DoC_Address(this, ADDR_PAGE, ofs, 0, 0);
1498 DoC_Command(this, NAND_CMD_ERASE2, 0);
1500 DoC_Command(this, NAND_CMD_STATUS, CDSN_CTRL_WP);
1502 dummy = ReadDOC(docptr, CDSNSlowIO);
1505 if (ReadDOC_(docptr, this->ioreg) & 1) {
1506 printf("Error erasing at 0x%lx\n", (long)ofs);
1507 /* There was an error */
1510 ofs += this->erasesize;
1511 len -= this->erasesize;
1518 static inline int doccheck(unsigned long potential, unsigned long physadr)
1520 unsigned long window=potential;
1521 unsigned char tmp, ChipID;
1522 #ifndef DOC_PASSIVE_PROBE
1526 /* Routine copied from the Linux DOC driver */
1528 #ifdef CFG_DOCPROBE_55AA
1529 /* Check for 0x55 0xAA signature at beginning of window,
1530 this is no longer true once we remove the IPL (for Millennium */
1531 if (ReadDOC(window, Sig1) != 0x55 || ReadDOC(window, Sig2) != 0xaa)
1533 #endif /* CFG_DOCPROBE_55AA */
1535 #ifndef DOC_PASSIVE_PROBE
1536 /* It's not possible to cleanly detect the DiskOnChip - the
1537 * bootup procedure will put the device into reset mode, and
1538 * it's not possible to talk to it without actually writing
1539 * to the DOCControl register. So we store the current contents
1540 * of the DOCControl register's location, in case we later decide
1541 * that it's not a DiskOnChip, and want to put it back how we
1544 tmp2 = ReadDOC(window, DOCControl);
1546 /* Reset the DiskOnChip ASIC */
1547 WriteDOC(DOC_MODE_CLR_ERR | DOC_MODE_MDWREN | DOC_MODE_RESET,
1548 window, DOCControl);
1549 WriteDOC(DOC_MODE_CLR_ERR | DOC_MODE_MDWREN | DOC_MODE_RESET,
1550 window, DOCControl);
1552 /* Enable the DiskOnChip ASIC */
1553 WriteDOC(DOC_MODE_CLR_ERR | DOC_MODE_MDWREN | DOC_MODE_NORMAL,
1554 window, DOCControl);
1555 WriteDOC(DOC_MODE_CLR_ERR | DOC_MODE_MDWREN | DOC_MODE_NORMAL,
1556 window, DOCControl);
1557 #endif /* !DOC_PASSIVE_PROBE */
1559 ChipID = ReadDOC(window, ChipID);
1562 case DOC_ChipID_Doc2k:
1563 /* Check the TOGGLE bit in the ECC register */
1564 tmp = ReadDOC(window, 2k_ECCStatus) & DOC_TOGGLE_BIT;
1565 if ((ReadDOC(window, 2k_ECCStatus) & DOC_TOGGLE_BIT) != tmp)
1569 case DOC_ChipID_DocMil:
1570 /* Check the TOGGLE bit in the ECC register */
1571 tmp = ReadDOC(window, ECCConf) & DOC_TOGGLE_BIT;
1572 if ((ReadDOC(window, ECCConf) & DOC_TOGGLE_BIT) != tmp)
1577 #ifndef CFG_DOCPROBE_55AA
1579 * if the ID isn't the DoC2000 or DoCMillenium ID, so we can assume
1580 * the DOC is missing
1583 printf("Possible DiskOnChip with unknown ChipID %2.2X found at 0x%lx\n",
1587 #ifndef DOC_PASSIVE_PROBE
1588 /* Put back the contents of the DOCControl register, in case it's not
1589 * actually a DiskOnChip.
1591 WriteDOC(tmp2, window, DOCControl);
1596 puts ("DiskOnChip failed TOGGLE test, dropping.\n");
1598 #ifndef DOC_PASSIVE_PROBE
1599 /* Put back the contents of the DOCControl register: it's not a DiskOnChip */
1600 WriteDOC(tmp2, window, DOCControl);
1605 void doc_probe(unsigned long physadr)
1607 struct DiskOnChip *this = NULL;
1610 if ((ChipID = doccheck(physadr, physadr))) {
1612 for (i=0; i<CFG_MAX_DOC_DEVICE; i++) {
1613 if (doc_dev_desc[i].ChipID == DOC_ChipID_UNKNOWN) {
1614 this = doc_dev_desc + i;
1620 puts ("Cannot allocate memory for data structures.\n");
1624 if (curr_device == -1)
1627 memset((char *)this, 0, sizeof(struct DiskOnChip));
1629 this->virtadr = physadr;
1630 this->physadr = physadr;
1631 this->ChipID = ChipID;
1635 puts ("No DiskOnChip found\n");
1639 void doc_probe(unsigned long physadr) {}